# Read only properties

**URL:** <https://community.hubspot.com/t/read-only-properties/11950>\
**Category:** APIs & Integrations\
**Created:** [September 15, 2018, 9:21am UTC](https://community.hubspot.com/t/read-only-properties/11950 "2018-09-15T09:21:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tanisha](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/tanisha/32/97852_2.png) [@Tanisha](https://community.hubspot.com/u/Tanisha)\
**Post date:** [September 15, 2018, 9:21am UTC](https://community.hubspot.com/t/read-only-properties/11950/1 "2018-09-15T09:21:54Z")

</div>

properties such as first page seen , number of visits, first referring site,ipaddress are read only value.Values are not updated  
Property - First page seen  
Request body  
{  
“properties”: [  
{  
“property”: “email”,  
“value”: “[tesi1ngsd@hubspot.com](mailto:tesi1ngsd@hubspot.com)”  
},  
{  
“property”: “firstname”,  
“value”: “Adrian”  
},  
{  
“property”: “lastname”,  
“value”: “Mott”  
},  
{  
“property”: “website”,  
“value”: “[http://hubspot.com](http://hubspot.com)”  
},  
{  
“property”: “company”,  
“value”: “HubSpot”  
},  
{  
“property”: “phone”,  
“value”: “555-122-2323”  
},  
{  
“property”: “address”,  
“value”: “25 First Street”  
},  
{  
“property”: “city”,  
“value”: “Cambridge”  
},  
{  
“property”: “state”,  
“value”: “MA”  
},  
{  
“property”: “zip”,  
“value”: “02139”  
},  
{  
“property”:“hs\_analytics\_first\_url”,  
“value”:“[http://hubspot.com](http://hubspot.com)”  
}  
]  
}

Response body  
{

“status”: “error”,

“message”: “Property values were not valid”,

“correlationId”: “b217c14d-5378-4ea6-825a-8e5b308f428c”,

“validationResults”:[

{“isValid”: false, “message”: ““hs\_analytics\_first\_url” is a read only property; its value cannot be set.”, “error”: “READ\_ONLY\_VALUE”,…}

],

“requestId”: “c0d82f31975d5a6a8d97ce0be17c688b”

}  
The similar response getting for read only properties

---

<div class="post-metadata">

**Author:** ![cbarley](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/cbarley/32/82559_2.png) [@cbarley](https://community.hubspot.com/u/cbarley)\
**Post date:** [September 17, 2018, 3:48pm UTC](https://community.hubspot.com/t/read-only-properties/11950/2 "2018-09-17T15:48:53Z")

</div>

Hi @Tanisha, this is expected as those properties are set upon first visit for a contact, and are set via the tracking code and the cookies we drop in: [https://developers.hubspot.com/docs/methods/tracking\_code\_api/tracking\_code\_overview](https://developers.hubspot.com/docs/methods/tracking_code_api/tracking_code_overview). These fields cannot be manipulated